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Class Copy - Do Not Write On This Test!!! ID: A

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Chapter 13 Study Questions

True/False

Indicate whether the statement is true or false.

1. A solution with a solute concentration greater than the solubility is called a supercritical solution.

2. Adding a nonvolatile solute to a solution decreases the vapor pressure of the solution.

3. After swimming in the ocean for several hours, swimmers noticed that their fingers appeared to be very wrinkled.

This is an indication that seawater is supertonic relative to the fluid in cells.

4. The value of the boiling-point-elevation constant (Kb) depends on the identity of the solvent.

Multiple Choice

Identify the choice that best completes the statement or answers the question.

5. The process of solute particles being surrounded by solvent particles is known as __________.

a. salutation

b. agglomeration

c. solvation

d. agglutination

e. dehydration

6. The dissolution of water in octane (C8H18) is prevented by __________.

a. London dispersion forces between octane molecules

b. hydrogen bonding between water molecules

c. dipole-dipole attraction between octane molecules

d. ion-dipole attraction between water and octane molecules

e. repulsion between like-charged water and octane molecules

7. When argon is placed in a container of neon, the argon spontaneously disperses throughout the neon because

__________.

a. of the large attractive forces between argon and neon atoms

b. of hydrogen bonding

c. a decrease in energy occurs when the two mix

d. the dispersion of argon atoms produces an increase in disorder

e. of solvent-solute interactions

8. Hydration is a specific example of the phenomenon known generally as __________.

a. salutation

b. disordering

c. solvation

d. condensation

e. dilution

ID: A

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9. The dissolution of gases in water is virtually always exothermic because __________.

a. one of the two endothermic steps (separation of solute particles) in the

solution-formation process is unnecessary

b. the exothermic step in the solution-formation process is unnecessary

c. gases react exothermically with water

d. neither of the two endothermic steps in the solution-formation process is necessary

e. all three steps in the solution-formation process are exothermic

10. Formation of solutions where the process is endothermic can be spontaneous provided that __________.

a. they are accompanied by another process that is exothermic

b. they are accompanied by an increase in order

c. they are accompanied by an increase in disorder

d. the solvent is a gas and the solute is a solid

e. the solvent is water and the solute is a gas

11. The phrase "like dissolves like" refers to the fact that __________.

a. gases can only dissolve other gases

b. polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes

c. solvents can only dissolve solutes of similar molar mass

d. condensed phases can only dissolve other condensed phases

e. polar solvents dissolve nonpolar solutes and vice versa

12. Ammonium nitrate (NH4NO3) dissolves readily in water even though the dissolution is endothermic by 26.4

kJ/mol. The solution process is spontaneous because __________.

a. the vapor pressure of the water decreases upon addition of the solute

b. osmotic properties predict this behavior

c. of the decrease in enthalpy upon addition of the solute

d. of the increase in enthalpy upon dissolution of this strong electrolyte

e. of the increase in disorder upon dissolution of this strong electrolyte

13. When solutions of strong electrolytes in water are formed, the ions are surrounded by water molecules. These

interactions are described as a case of __________.

a. hydration

b. supersaturation

c. crystallization

d. dehydration

e. saturation

14. When two nonpolar organic liquids are mixed, a solution forms and the enthalpy of solution is quite small. Label

the two organic liquids as A (solvent) and B (solute). The formation of solution is favored by __________.

a. hydration of the solute, B

b. the equal enthalpy of the solvent and solute

c. the highly negative enthalpy of the solution process

d. solvation of the solvent, A

e. an increase in disorder, since A-A, B-B, and A-B interactions are similar

ID: A

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15. A saturated solution __________.

a. contains as much solvent as it can hold

b. contains no double bonds

c. contains dissolved solute in equilibrium with undissolved solute

d. will rapidly precipitate if a seed crystal is added

e. cannot be attained

16. In a saturated solution of a salt in water, __________.

a. the rate of crystallization > the rate of dissolution

b. the rate of dissolution > the rate of crystallization

c. seed crystal addition may cause massive crystallization

d. the rate of crystallization = the rate of dissolution

e. addition of more water causes massive crystallization

17. Compounds composed of a salt and water combined in definite proportions are known as

a. clathrates

b. homogenates

c. ionic solids

d. molecular solids

e. hydrates

18. An unsaturated solution is one that __________.

a. has no double bonds

b. contains the maximum concentration of solute possible, and is in equilibrium with

undissolved solute

c. has a concentration lower than the solubility

d. contains more dissolved solute than the solubility allows

e. contains no solute

19. A solution with a concentration higher than the solubility is __________.

a. is not possible

b. is unsaturated

c. is supercritical

d. is saturated

e. is supersaturated

20. A supersaturated solution __________.

a. is one with more than one solute

b. is one that has been heated

c. is one with a higher concentration than the solubility

d. must be in contact with undissolved solid

e. exists only in theory and cannot actually be prepared

21. Pairs of liquids that will mix in all proportions are called __________ liquids.

a. miscible

b. unsaturated

c. polar liquids

d. saturated

e. supersaturated

ID: A

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22. The solubility of oxygen gas in water at 25°C and 1.0 atm pressure of oxygen is 0.041 g/L. The solubility of

oxygen in water at 3.0 atm and 25°C is __________ g/L.

a. 0.041

b. 0.014

c. 0.31

d. 0.12

e. 3.0

23. The solubility of nitrogen gas in water at 25°C and a nitrogen pressure of 1.0 atm is The solubility of

nitrogen in water at a nitrogen pressure of 0.80 atm is __________ M.

a. 5.5 × 10-4

b. 8.6 × 10-4

c. 1.2 × 103

d. 3.7 × 10-3

e. 0.80

24. The solubility of Ar in water at 25°C is 1.6 × 10-3 M when the pressure of the Ar above the solution is 1.0 atm.

The solubility of Ar at a pressure of 2.5 atm is __________ M.

a. 1.6 × 103

b. 6.4 × 10-4

c. 4.0 × 10-3

d. 7.5 × 10-2

e. 1.6 × 10-3

25. On a clear day at sea level, with a temperature of 25°C, the partial pressure of N2 in air is 0.78 atm and the

concentration of nitrogen in water is When the partial pressure of N2 is __________ atm, the

concentration in water is

a. 0.63 atm

b. 0.78 atm

c. 1.0 atm

d. 2.1 atm

e. 1.6 atm

26. Which one of the following vitamins is water soluble?

a. A

b. B

c. K

d. D

e. E

ID: A

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27. A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100°C, with precautions taken to avoid

evaporation of any water. The solution is cooled to 30.0°C and no precipitate is observed. This solution is

__________.

a. hydrated

b. placated

c. saturated

d. unsaturated

e. supersaturated

28. A sample of potassium chlorate (15.0 g) is dissolved in 201 g of water at with precautions taken to avoid

evaporation of any water. The solution is cooled to and no precipitate is observed. This solution is

__________.

a. hydrated

b. miscible

c. saturated

d. unsaturated

e. supersaturated

29. A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at with precautions taken to avoid

evaporation of any water. The solution is cooled to and a small amount of precipitate is observed. This

solution is __________.

a. hydrated

b. placated

c. saturated

d. unsaturated

e. supersaturated

ID: A

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30. The solubility of MnSO4 monohydrate in water at 20°C is 70.0 g per 100.0 mL of water. A solution at that is

4.22 M in MnSO4 monohydrate is best described as a(n) __________ solution. The formula weight of MnSO4

monohydrate is 168.97 g/mol.

a. hydrated

b. solvated

c. saturated

d. unsaturated

e. supersaturated

31. The principal reason for the extremely low solubility of NaCl in benzene (C6H6) is the __________.

a. strong solvent-solvent interactions

b. hydrogen bonding in C6H6

c. strength of the covalent bond in NaCl

d. weak solvation of Na+ and Cl- by C6H6

e. increased disorder due to mixing of solute and solvent

32. Which one of the following substances would be the most soluble in CCl4?

a. CH3CH2OH

b. H2O

c. NH3

d. C10H22

e. NaCl

33. Which of the following substances is more likely to dissolve in water?

a. HOCH2CH2OH

b. CHCl3

c.

d. CH3(CH2)8CH2OH

e. CCl4

34. Which of the following substances is more likely to dissolve in CH3OH?

a. CCl4

b. Kr

c. N2

d. CH3CH2OH

e. H2

35. Which one of the following substances is more likely to dissolve in CCl4?

a. CBr4

b. HBr

c. HCl

d. CH3CH2OH

e. NaCl

ID: A

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36. Which one of the following substances is more likely to dissolve in benzene (C6H6)?

a. CH3CH2OH

b. NH3

c. NaCl

d. CCl4

e. HBr

37. Which one of the following is most soluble in water?

a. CH3OH

b. CH3CH2CH2OH

c. CH3CH2OH

d. CH3CH2CH2CH2OH

e. CH3CH2CH2CH2CH2OH

38. Which one of the following is most soluble in hexane (C6H14)?

a. CH3OH

b. CH3CH2CH2OH

c. CH3CH2OH

d. CH3CH2CH2CH2OH

e. CH3CH2CH2CH2CH2OH

39. The largest value of the Henry's Law constant for the liquid solvent H2O will be obtained with __________ gas as

the solute and a temperature of __________°C.

a. C2H4, 45

b. Ar, 11

c. HCl, 49

d. CO2, 32

e. N2, 15

40. The solubility of nitrogen gas at 25°C and 1 atm is 6.8 x 10-4 mol/L. If the partial pressure of nitrogen gas in air is

0.76 atm, what is the concentration (molarity) of dissolved nitrogen?

a. 6.8 × 10-4 M

b. 5.2 × 10-4 M

c. 4.9 × 10-4 M

d. 3.8 × 10-4 M

e. 1.1 × 10-5 M

41. The concentration of CO2 in a soft drink bottled with a partial pressure of CO2 of 4.0 atm over the liquid at 25°C is

1.2 x 10-1 M. The Henry's law constant for CO2 at this temperature is _________.

a. 3.0 × 10-2 mol/L-atm

b. 4.5 × 10-3 mol/L-atm

c. 5.6 × 10-3 mol/L-atm

d. 2.3 × 10-2 mol/L-atm

e. More information is needed to solve the problem.

ID: A

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42. Pressure has an appreciable effect on the solubility of __________ in liquids.

a. gases

b. solids

c. liquids

d. salts

e. solids and liquids

43. Which of the following statements is false?

a. Nonpolar liquids tend to be insoluble in polar liquids.

b. The weaker the attraction between the solute and solvent molecules, the greater the

solubility.

c. Substances with similar intermolecular attractive forces tend to be soluble in one

another.

d. The solubility of a gas increases in direct proportion to its partial pressure above the

solution.

e. The solubility of gases in water decreases with increasing temperature.

44. Which of the following choices has the compounds correctly arranged in order of increasing solubility in water?

(least soluble to most soluble)

a. CCl4 < CHCl3 < NaNO3

b. CH3OH < CH4 < LiF

c. CH4 < NaNO3 < CHCl3

d. LiF < NaNO3 < CHCl3

e. CH3OH < Cl4 < CHCl3

45. The Procter & Gamble Company product called olestratm is formed by combining a sugar molecule with

__________.

a. alcohols

b. vitamin A

c. fatty acids

d. protein

e. cholesterol

46. Which component of air is the primary problem in a condition known as "the bends"?

a. O2

b. CO2

c. He

d. N2

e. CO

47. If the partial pressure of oxygen in the air a diver breathes is too great, __________.

a. respiratory tissue is damaged by oxidation

b. hyperventilation results

c. the urge to breathe is increased and excessive CO2 is removed from the body

d. the urge to breathe is reduced and not enough CO2 is removed from the body

e. No problems result from this situation.

ID: A

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48. The Henry's law constant for helium gas in water at 30°C is 3.70 × 10-4 M/atm. When the partial pressure of

helium above a sample of water is 0.650 atm, the concentration of helium in the water is __________ M.

a. 5.69 × 10-4

b. 1.76 × 103

c. 1.30

d. 2.41 × 10-4

e. 3.70 × 10-4

49. A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05

g/mL. The concentration of CaCl2 is __________% by mass.

a. 5.94

b. 6.32

c. 0.0632

d. 0.0594

e. 6.24

50. The concentration of urea in a solution prepared by dissolving 16 g of urea in 39 g of H2O is __________% by

mass. The molar mass of urea is 60.0 g/mol.

a. 29

b. 41

c. 0.29

d. 0.41

e. 0.48

51. The concentration of nitrate ion in a solution that contains 0.900 M aluminum nitrate is __________ M.

a. 0.900

b. 0.450

c. 0.300

d. 2.70

e. 1.80

52. The concentration of KBr in a solution prepared by dissolving 2.21 g of KBr in 897 g of water is __________

molal.

a. 2.46

b. 0.0167

c. 0.0207

d. 2.07 × 10-5

e. 0.0186

53. The concentration of lead nitrate (Pb(NO3)2) in a 0.726 M solution is __________ molal. The density of the

solution is 1.202 g/mL.

a. 0.476

b. 1.928

c. 0.755

d. 0.819

e. 0.650

ID: A

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54. The concentration of a benzene solution prepared by mixing 12.0 g C6H6 with 38.0 g CCl4 is __________ molal.

a. 4.04

b. 0.240

c. 0.622

d. 0.316

e. 0.508

55. A solution is prepared by dissolving 15.0 g of NH3 in 250.0 g of water. The density of the resulting solution is

0.974 g/mL. The mole fraction of NH3 in the solution is __________.

a. 0.0640

b. 0.0597

c. 0.940

d. 0.922

e. 16.8

56. A solution is prepared by dissolving 15.0 g of NH3 in 250.0 g of water. The density of the resulting solution is

0.974 g/mL. The molarity of NH3 in the solution is __________.

a. 0.00353

b. 0.882

c. 60.0

d. 3.24

e. 3.53


g/mL.The concentration of Cl- in this solution is __________ M.

a. 0.214

b. 0.562

c. 1.12

d. 1.20

e. 6.64 × 10-2


g/mL. The concentration of CaCl2 in this solution is __________ molal.

a. 0.214

b. 0.569

c. 5.70

d. 63.2

e. 1.76

59. The concentration of HCl in a solution that is prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is

__________ molal.

a. 27.5

b. 7.5 × 10-4

c. 3.3 × 10-2

d. 0.75

e. 1.3

ID: A

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60. The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is __________

M. The density of the solution is 0.79 g/mL.

a. 21

b. 0.93

c. 0.58

d. 6.0 × 10-4

e. 1.72

61. The mole fraction of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g of Ne is

__________.

a. 0.60

b. 1.5

c. 0.20

d. 0.11

e. 0.86

62. The mole fraction of urea (MW = 60.0 g/mol) in a solution prepared by dissolving 16 g of urea in 39 g of H2O is

__________.

a. 0.58

b. 0.37

c. 0.13

d. 0.11

e. 9.1

63. The concentration of urea (MW = 60.0 g/mol) in a solution prepared by dissolving 16 g of urea in 39 g of H2O is

__________ molal.

a. 96

b. 6.8

c. 0.68

d. 6.3

e. 0.11

64. The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is

__________ M. The density of the solution is 1.3 g/mL.

a. 0.11

b. 3.7

c. 6.8

d. 6.3

e. 0.16

65. What is the molarity of sodium chloride in solution that is 13.0% by mass sodium chloride and that has a density

of 1.10 g/mL?

a. 143

b. 2.45

c. 2.56

d. 2.23

e. 1.43 × 10-2

ID: A

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66. The concentration of sodium chloride in an aqueous solution that is 2.23 M and that has a density of 1.01 g/mL is

__________% by mass.

a. 2.21

b. 7.83

c. 45.3

d. 12.9

e. 10.1

67. A solution contains 28% phosphoric acid by mass. This means that __________.

a. 1 mL of this solution contains 28 g of phosphoric acid

b. 1 L of this solution has a mass of 28 g

c. 100 g of this solution contains 28 g of phosphoric acid

d. 1 L of this solution contains 28 mL of phosphoric acid

e. the density of this solution is 2.8 g/mL

68. Calculate the molality of a 25.4% (by mass) aqueous solution of phosphoric acid (H3PO4).

a. 2.59 m

b. 3.47 m

c. 4.45 m

d. 25.4 m

e. The density of the solution is needed to solve the problem.

69. Calculate the molarity of a 25.4% (by mass) aqueous solution of phosphoric acid (H3PO4).

a. 2.59 m

b. 3.47 m

c. 4.45 m

d. 25.4 m


70. Calculate the mole fraction of phosphoric acid (H3PO4) in a 25.4% (by mass) aqueous solution.

a. 0.0589

b. 0.0626

c. 0.259

d. 1.00

e. 4.14

71. Calculate the molality of a 10.0% (by mass) aqueous solution of hydrochloric acid.

a. 0.274 m

b. 2.74 m

c. 3.05 m

d. 4.33 m


72. Calculate the molarity of a 10.0% (by mass) aqueous solution of hydrochloric acid.

a. 0.274 m

b. 2.74 m

c. 3.04 m

d. 4.33 m


ID: A

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73. Calculate the mole fraction of HCl in a 10.0% (by mass) aqueous solution.

a. 0.00111

b. 0.0344

c. 0.0520

d. 0.0548

e. 0.122

74. A solution is prepared by dissolving calcium chloride in water and diluting to 500.0 mL. If this solution contains

44 ppm chloride ions, the concentration of calcium ions is __________ ppm.

a. 44

b. 88

c. 22

d. 11

e. 500

75. Molality is defined as the __________.

a. moles solute/moles solvent

b. moles solute/Liters solution

c. moles solute/kg solution

d. moles solute/kg solvent

e. none (dimensionless)

76. Which one of the following concentration units varies with temperature?

a. molarity

b. mass percent

c. mole fraction

d. molality

e. all of the above

77. Of the concentration units below, only __________ is temperature dependent.

a. mass %

b. ppm

c. ppb

d. molarity

e. molality

78. A solution contains 11% by mass of sodium chloride. This means that __________.

a. there are 11 g of sodium chloride in in 1.0 mL of this solution

b. 100 g of the solution contains 11 g of sodium chloride

c. 100 mL of the solution contains 11 g of sodium chloride

d. the density of the solution is 11 g/mL

e. the molality of the solution is 11

79. A solution contains 15 ppm of benzene. The density of the solution is 1.00 g.mL. This means that __________.

a. there are 15 mg of benzene in 1.0 L of this solution

b. 100 g of the solution contains 15 g of benzene

c. 100 g of the solution contains 15 mg of benzene

d. the solution is 15% by mass of benzene

e. the molarity of the solution is 15

ID: A

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80. A solution contains 15 ppm of benzene. The density of the solution is 1.00 g.mL. This means that __________.

a. there are 15 mg of benzene in 1.0 g of this solution

b. 100 g of the solution contains 15 g of benzene

c. 1.0 g of the solution contains 15 × 10-6 g of benzene

d. 1.0 L of the solution contains 15 g of benzene

e. the solution is 15% by mass of benzene

81. A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is __________

molal.

a. 1.61 × 10-3

b. 622

c. 0.622

d. 1.27 × 103

e. 1.61

82. A solution is prepared by dissolving 16.2 g of benzene (C6H6) in 282 g of carbon tetrachloride The

concentration of benzene in this solution is __________ molal. The molar masses of and CCl4 are

and respectively.

a. 7.36 × 10-4

b. 0.736

c. 0.102

d. 0.0543

e. 5.43

83. At 20°C, an aqueous solution that is 24.0% by mass in ammonium chloride has a density of 1.0674 g/mL. What is

the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

a. 5.90

b. 0.479

c. 4.79

d. 0.0445

e. 22.5

84. At 20°C, a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL. What is the molality of

ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

a. 2.55

b. 0.0449

c. 2.32

d. 0.446

e. 12.00

85. At 20°C, a 0.376 M aqueous solution of ammonium chloride has a density of 1.0045 g/mL. What is the mass % of

ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

a. 0.381

b. 0.705

c. 0.374

d. 2.68

e. 2.00

ID: A

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86. The vapor pressure of pure ethanol at 60 °C is 0.459 atm. Raoult's Law predicts that a solution prepared by

dissolving 10.0 mmol naphthalene (nonvolatile) in 90.0 mmol ethanol will have a vapor pressure of __________

atm.

a. 0.498

b. 0.413

c. 0.790

d. 0.367

e. 0.0918

87. The vapor pressure of pure water at 25°C is 23.8 torr. What is the vapor pressure (torr) of water above a solution

prepared by dissolving 18.0 g of glucose (a nonelectrolyte, MW = 180.0 g/mol) in 95.0 g of water?

a. 24.3

b. 23.4

c. 0.451

d. 0.443

e. 23.8

88. The vapor pressure of pure water at 25°C is 23.8 torr. Determine the vapor pressure (torr) of water at above a

solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = in 75 g of water.

a. 2.9

b. 3.3

c. 21

d. 27

e. 0.88

89. The freezing point of ethanol (C2H5OH) is -114.6 °C. The molal freezing point depression constant for ethanol is

2.00 °C/m. What is the freezing point (°C) of a solution prepared by dissolving 50.0 g of glycerin a

nonelectrolyte) in 200.0 g of ethanol?

a. -115

b. -5.42

c. -132.3

d. -120.0

e. -114.6

90. What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of (formula weight = 164

g/mol) in 115 g of water? The molal freezing point depression constant for water is

a. -3.34

b. -1.11

c. 3.34

d. 1.11

e. 0.00

91. A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of -3.33°C. Given

for water, the molar mass of the unknown liquid is

a. 69.0

b. 333

c. 619

d. 161

e. 62.1

ID: A

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92. A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of solution. The

osmotic pressure of the solution is at 25°C. The molecular weight of nicotine is

a. 28

b. 43

c. 50

d. 160

e. 0.60

93. A solution is prepared by dissolving 6.00 g of an unknown nonelectrolyte in enough water to make 1.00 L of

solution. The osmotic pressure of this solution is 0.750 atm at 25.0°C. What is the molecular weight (g/mol) of the

unknown solute?

a. 16.4

b. 196

c. 110

d. 30.6

e. 5.12 × 10-3

94. Calculate the freezing point (0°C) of a 0.05500 m aqueous solution of glucose. The molal

freezing-point-depression constant of water is

a. 0.0286

b. 0.106

c. -0.0562

d. -0.102

e. -0.204

95. Calculate the freezing point (0°C) of a 0.05500 m aqueous solution of NaNO3. The molal

freezing-point-depression constant of water is

a. 0.0286

b. -0.106

c. 0.102

d. -0.0562

e. -0.205

96. An aqueous solution of a soluble compound (a nonelectrolyte) is prepared by dissolving of the compound in

sufficient water to form of solution. The solution has an osmotic pressure of 1.2 atm at What is the

molar mass (g/mL) of the compound?

a. 1.0 × 103

b. 2.7 × 103

c. 2.3 × 102

d. 6.8 × 102

e. 28

97. Determine the freezing point (°C) of a 0.015 molal aqueous solution of MgSO4. Assume i = 2.0 for MgSO4. The

molal freezing-point-depression constant of water is

a. -0.056

b. -0.028

c. -0.17

d. -0.084

e. 0.000

ID: A

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98. A solution is prepared by dissolving 2.60 g of a strong electrolyte (formula weight = 101 g/mol) in enough water

to make 1.00 L of solution. The osmotic pressure of the solution is 1.25 atm at 25.0°C. What is the van't Hoff

factor (i) for the unknown solute?

a. 0

b. 0.99

c. 1.98

d. 2.98

e. 0.630

99. George is making spaghetti for dinner. He places 4.01 kg of water in a pan and brings it to a boil. Before adding

the pasta, he adds 58 g of table salt (NaCl) to the water and again brings it to a boil. The temperature of the salty,

boiling water is __________°C.

Assume a pressure of 1.00 atm and negligible evaporation of water. Kb for water is

a. 99.87

b. 100.26

c. 100.13

d. 99.74

e. 100.00

100. A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure?

a. KClO4

b. Ca(ClO4)2

c. Al(ClO4)3

d. sucrose

e. NaCl

101. The magnitudes of Kf and of Kb depend on the identity of the __________.

a. solute

b. solvent

c. solution

d. solvent and on temperature

e. solute and solvent

102. As the concentration of a solute in a solution increases, the freezing point of the solution __________ and the

vapor pressure of the solution __________.

a. increases, increases

b. increases, decreases

c. decreases, increases

d. decreases, decreases

e. decreases, is unaffected

103. Which of the following liquids will have the lowest freezing point?

a. pure H2O

b. aqueous glucose (0.60 m)

c. aqueous sucrose (0.60 m)

d. aqueous FeI3 (0.24 m)

e. aqueous KF (0.50 m)

ID: A

18

104. Which of the following liquids will have the lowest freezing point?

a. pure H2O

b. aqueous glucose (0.050 m)

c. aqueous CoI2 (0.030 m)

d. aqueous FeI3 (0.030 m)

e. aqueous NaI (0.030 m)

105. A 1.35 m aqueous solution of compound X had a boiling point of 101.4°C. Which one of the following could be

compound X? The boiling point elevation constant for water is

a. CH3CH2OH

b. C6H12O6

c. Na3PO4

d. KCl

e. CaCl2

106. Which produces the greatest number of ions when one mole dissolves in water?

a. NaCl

b. NH4NO3

c. NH4Cl

d. Na2SO4

e. sucrose

107. Of the following, a 0.1 M aqueous solution of __________ will have the lowest freezing point.

a. NaCl

b. Al(NO3)3

c. K2CrO4

d. Na2SO4

e. sucrose

108. Of the following, a 0.2 M aqueous solution of __________ will have the highest freezing point.

a. (NH4)3PO4

b. Pb(NO3)2

c. Na3PO4

d. Mg(NO3)2

e. NaCl

109. Which of the following aqueous solutions will have the highest boiling point?

a. 0.10 m Na2SO4

b. 0.20 m glucose

c. 0.25 m sucrose

d. 0.10 m NaCl

e. 0.10 m SrSO4

110. The most likely van't Hoff factor for an 0.01 m CaI2 solution is __________.

a. 1.00

b. 3.00

c. 1.27

d. 2.69

e. 3.29

ID: A

19

111. Which one of the following solutes has a limiting van't Hoff factor (i) of 3 when dissolved in water?

a. KNO3

b. CH3OH

c. CCl4

d. Na2SO4

e. sucrose

112. The ratio of the actual value of a colligative property to the value calculated, assuming the substance to be a

nonelectrolyte, is referred to as __________.

a. Henry's law

b. vapor pressure lowering

c. the van't Hoff factor

d. freezing point depression

e. osmotic pressure

113. The ideal value of i (van't Hoff factor) for (NH4)3PO4.

a. 1

b. 2

c. 3

d. 4

e. 5

114. Colligative properties of solutions include all of the following except __________.

a. depression of vapor pressure upon addition of a solute to a solvent

b. elevation of the boiling point of a solution upon addition of a solute to a solvent

c. depression of the freezing point of a solution upon addition of a solute to a solvent

d. an increase in the osmotic pressure of a solution upon the addition of more solute

e. the increase of reaction rates with increase in temperature

115. Calculate the vapor pressure of a solution made by dissolving 109 grams of glucose (molar mass = 180.2 g/mol) in

920.0 ml of water at 25°C. The vapor pressure of pure water at 25°C is 23.76 mm Hg. Assume the density of the

solution is 1.00 g/ml.

a. 0.278 mm Hg

b. 0.605 mm Hg

c. 22.98 mm Hg

d. 23.48 mm Hg

e. 23.76 mm Hg

116. A solution is prepared by dissolving 7.00 g of glycerin (C3H8O3) in 201 g of ethanol The freezing

point of the solution is __________°C. The freezing point of pure ethanol is at 1 atm. The

molal-freezing-point-depression constant (Kf) for ethanol is The molar masses of glycerin and of ethanol

are 92.1 g/mol and 46.1 g/mol, respectively.

a. -121.3

b. 0.752

c. -107.9

d. -113.8

e. -115.4

ID: A

20

117. Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water. The

molal-freezing-point-depression constant (Kf) for water is

a. -0.45 oC

b. +0.45 oC

c. -0.23 oC

d. +0.23 oC

e. 1.23 oC

118. The osmotic pressure of a solution formed by dissolving 25.0 mg of aspirin in 0.250 L of water at 25°C

is __________ atm.

a. 13.6

b. 1.14 × 10-3

c. 0.0136

d. 2.45

e. 1.38

119. A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at The partial pressure

of water above the solution is __________ torr. The vapor pressure of pure water at 55°C is 118.0 torr. The MW

of lactose is

a. 1.670

b. 94.1

c. 169.4

d. 116.3

e. 92.7

Completion

Complete each statement.

120. The formula weight of FeCl3.6H2O is __________.

121. Water (H2O) and the alcohol methanol (CH3OH) are infinitely soluble in each other. The primary intermolecular

force responsible for this is __________.

122. For a dilute aqueous solution, a concentration of 1 ppm also corresponds to a concentration of 1 __________ per

liter of solution.

123. For a dilute aqueous solution, a concentration of 1 ppb also corresponds to a concentration of 1 __________ per

liter of solution.

124. What is the osmotic pressure (in atm) of a 0.040 M solution of a non-electrolyte at 30.0 oC?

125. Physical properties of a solution that depend on the quantity of the solute particles present, but not the kind or

identity of the particles, are termed __________ properties.

126. A solution contains 150.8 grams of NaCl in 678.3 grams of water. Calculate the vapor pressure lowering (in torr)

of the solution at 25.0°C. (Note: The vapor pressure of pure water at 25.0°C is 23.76 torr.)

ID: A

21

127. A solution contains 150.8 grams of NaCl in 678.3 grams of water. Calculate the vapor pressure of water (in torr)

over the solution at 25.0°C. (Note: The vapor pressure of pure water at 25.0°C is 23.76 torr.)

ID: A

1

Chapter 13 Study Questions

Answer Section

TRUE/FALSE

1. ANS: F PTS: 1 DIF: 2 REF: Sec. 13.3

2. ANS: T PTS: 1 DIF: 2 REF: Sec. 13.5

3. ANS: F PTS: 1 DIF: 2 REF: Sec. 13.5

4. ANS: T PTS: 1 DIF: 2 REF: Sec. 13.5

MULTIPLE CHOICE

5. ANS: C PTS: 1 DIF: 1 REF: Sec. 13.1

6. ANS: B PTS: 1 DIF: 2 REF: Sec. 13.1

7. ANS: D PTS: 1 DIF: 2 REF: Sec. 13.1


9. ANS: A PTS: 1 DIF: 2 REF: Sec. 13.1



12. ANS: E PTS: 1 DIF: 2 REF: Sec. 13.1

























ID: A

2














































ID: A

3







































COMPLETION

120. ANS: 270.294

PTS: 1 DIF: 3 REF: Sec. 13.2

ID: A

4

121. ANS: hydrogen bonding


122. ANS: milligram


123. ANS: microgram


124. ANS: 1.0


125. ANS: colligative


126. ANS: 2.864


127. ANS: 20.90


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